*2.1. Solid Ceramic End Mill Design and Geometry*

Figure 2a shows a drawing, and Figure 2b is a general view of experimental solid ceramic end mills under development and field testing. Table 1 provides detailed information on the design and geometric parameters of the cutting tool. The experimental samples of end mills produced in this framework of the current study were compared with ceramic tools of a similar design and geometry, which are now commercially manufactured from SiAlON-based ceramics, including Yb-containing stabilizing phases (commercial ceramic mills), and adopted by the authors as a standard.

**Figure 2.** Drawing (**a**) and general view (**b**) of experimental samples of solid ceramic end mills made by the team of authors.


**Table 1.** The geometric design of solid ceramic end mills for development and testing purposes.
